Magento released SUPEE 10888 containing multiple security enhancements to provide the security against cross-site scripting (XSS), cross-site request forgery (CSRF) and other vulnerabilities.
There are 2 ways to Magento Supee 10888 install patches: with SSH or without SSH. It is advisable to upgrade your Magento to the latest version Magento 1.9.3.10 which includes all the security patches including SUPEE 10888. For help regarding Magento Version
Upgrade, For more info , visit : https://meetanshi.com/blog/install-magento-supee-10888/